What is the effect of a charge in a sexual assault trial that states that a defendant must choose between two permissible inferences?

Here although the charge informed the jury that as between two permissible inferences defendants were entitled to the one consistent with innocence and that the People must prove every element of a crime beyond a reasonable doubt, the former was part of the general introductory portion of the charge concerning inferences and the latter was given in a discussion of weighing proof. Neither was directly related, as it should have been, to the "complex and problematical reasoning process necessarily undertaken in cases of purely circumstantial evidence" (People v. Barnes, 50 N.Y.2d 375, 381, 429 N.Y.S.2d 178, 406 N.E.2d 1071; accord, People v. Benzinger, loc. cit., supra).